Abstract
Non-relativistic hollow electron beam formation for mm-wave BWO
Highlights
Slow-wave devices such as traveling-wave tubes (TWTs), backward-wave oscillators (BWOs), and extended-interaction klystrons (EIKs) are widely used as medium-power sources of short-millimeter and subterahertz waves
Like in the case of sheet beams, the use of hollow electron beams permits a significant decrease in current density and heating of the microwave structure
A W-band BWO with operating voltage of 30–32 kV has been designed in the Institute of Applied Physics
Summary
Slow-wave devices such as traveling-wave tubes (TWTs), backward-wave oscillators (BWOs), and extended-interaction klystrons (EIKs) are widely used as medium-power sources of short-millimeter and subterahertz waves. One of the difficulties that limits the CW or average power of slow-wave devices at short waves is partial interception of the electron beams by fragile slowwave structures (SWS) causing dangerous heating of the latter. Another feasible and maybe somewhat simpler configuration is hollow rectilinear thin-wall electron beams interacting with the slow waves of azimuthally-symmetric operating waveguides [3, 4] similar to that of relativistic high-current microwave oscillators.
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